1.2V/100A Output DC-DC Converter Compliant with 48V Bus Voltage

This reference design provides specification, block diagram and PCB layout data of 1.2V/100A output isolated DC-DC converter which convert 48V bus voltage to 1.2V directly.

Features of 1.2V/100A output DC-DC converter compliant with 48V bus voltage.
Block diagram of 1.2V/100A output DC-DC converter compliant with 48V bus voltage.

Features

  • Total efficiency : 92.8%(Vin=54.5V, 30% load)
  • Outline size : 160mm x 100mm x 30mm
  • Provides appropriate power MOSFETs and photocouplers totally.

Description

  • Input voltage : DC 40 to 59.5V
  • Output voltage : DC 1.2V
  • Output power : 120W
  • Circuit topology : Half Bridge + Synchronous Rectification
Efficiency curves of 1.2V/100A output DC-DC converter compliant with 48V bus voltage.
Efficiency curves

Design Documents

Materials for designers, such as an overview of circuit operation and explanations of design considerations. Please click on each tab to view the contents.

Design Data

Provides circuit data that can be loaded into EDA tools, PCB layout data, and data used in PCB manufacturing. Available in formats from multiple tool vendors. You can freely edit it with your preferred tool.

Used Toshiba Items

Part Number Device Category Portion Usage Description
Power MOSFET (N-ch single 60V<VDSS≤150V) Primary side, 2 N-ch MOSFET, 100 V, 0.0115 Ω@10V, TSON Advance, U-MOSⅨ-H
Power MOSFET (N-ch single VDSS≤30V) Secondary side synchronous rectification, 4 N-ch MOSFET, 30 V, 0.00065 Ω@10V, SOP Advance, U-MOSⅨ-H
Photocoupler (phototransistor output) Output voltage feedback, 1 Photocoupler (phototransistor output), DC input, 5000 Vrms, DIP4(TLP785)
Photocoupler (photo-IC output) Communication between primary side and secondary side, 2 Photocoupler (photo-IC output), High-speed, 50 Mbps, 5000 Vrms, SO6L
Small-signal Schottky barrier diode Primary side, 2 30 V/0.2 A Schottky Barrier Diode, SOT-23(SOT23)
Switching diode Primary side, 3
Secondary side, 2		 100 V/0.25 A Switching diode, SOD-323(USC)

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